package com.haidechizi.tree;

public class BinaryTree {

    Node root;

    public void frontShow() {
        if(root == null) {
            return;
        }
        this.root.frontShow();
    }

    public void midShow() {
        if(root ==null) {
            return;
        }
        root.midShow();
    }

    public void afterShow() {
        if(root == null) {
            return;
        }
        root.afterShow();
    }


}

